[Zope] Upgrading from Zope 2.4.1 to Zope 2.4.3 on Windows

Hi, I'm using zope 2.4.1 for an intranet site and wish to upgrade to 2.4.3 so that I can try out the CMF. I downloaded the binary upgrade file called Zope-2.4.x-to-2.4.3-win32-x86.gz . When I unpack this using Winzip, all I get is a single file called Zope-2.4.x-to-2.4.3-win32-x86. I place this file in the root directory but Control Panel still shows the release as 2.4.1. I think that the winzip operation should give me more than the single file. What is going wrong? Cheers, John John Knutson Business Development Manager Candle Service Ltd Telephone: +44-1276-414836 Mobile: +44-7770-816157 Home office: +44-1962-844719